EP3045147B1 - Ersatzklappe - Google Patents

Ersatzklappe Download PDF

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Publication number
EP3045147B1
EP3045147B1 EP16152466.5A EP16152466A EP3045147B1 EP 3045147 B1 EP3045147 B1 EP 3045147B1 EP 16152466 A EP16152466 A EP 16152466A EP 3045147 B1 EP3045147 B1 EP 3045147B1
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EP
European Patent Office
Prior art keywords
stent
valve
component
skirt
fabric
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Revoked
Application number
EP16152466.5A
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English (en)
French (fr)
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EP3045147A1 (de
EP3045147B8 (de
Inventor
Stephane Delaloye
Jean-Luc Hefti
Serge Delaloye
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Symetis SA
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Symetis SA
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Application filed by Symetis SA filed Critical Symetis SA
Publication of EP3045147A1 publication Critical patent/EP3045147A1/de
Publication of EP3045147B1 publication Critical patent/EP3045147B1/de
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Revoked legal-status Critical Current
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Classifications

    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61F—FILTERS IMPLANTABLE INTO BLOOD VESSELS; PROSTHESES; DEVICES PROVIDING PATENCY TO, OR PREVENTING COLLAPSING OF, TUBULAR STRUCTURES OF THE BODY, e.g. STENTS; ORTHOPAEDIC, NURSING OR CONTRACEPTIVE DEVICES; FOMENTATION; TREATMENT OR PROTECTION OF EYES OR EARS; BANDAGES, DRESSINGS OR ABSORBENT PADS; FIRST-AID KITS
    • A61F2/00—Filters implantable into blood vessels; Prostheses, i.e. artificial substitutes or replacements for parts of the body; Appliances for connecting them with the body; Devices providing patency to, or preventing collapsing of, tubular structures of the body, e.g. stents
    • A61F2/02—Prostheses implantable into the body
    • A61F2/24—Heart valves ; Vascular valves, e.g. venous valves; Heart implants, e.g. passive devices for improving the function of the native valve or the heart muscle; Transmyocardial revascularisation [TMR] devices; Valves implantable in the body
    • A61F2/2412—Heart valves ; Vascular valves, e.g. venous valves; Heart implants, e.g. passive devices for improving the function of the native valve or the heart muscle; Transmyocardial revascularisation [TMR] devices; Valves implantable in the body with soft flexible valve members, e.g. tissue valves shaped like natural valves
    • A61F2/2418—Scaffolds therefor, e.g. support stents
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61F—FILTERS IMPLANTABLE INTO BLOOD VESSELS; PROSTHESES; DEVICES PROVIDING PATENCY TO, OR PREVENTING COLLAPSING OF, TUBULAR STRUCTURES OF THE BODY, e.g. STENTS; ORTHOPAEDIC, NURSING OR CONTRACEPTIVE DEVICES; FOMENTATION; TREATMENT OR PROTECTION OF EYES OR EARS; BANDAGES, DRESSINGS OR ABSORBENT PADS; FIRST-AID KITS
    • A61F2/00—Filters implantable into blood vessels; Prostheses, i.e. artificial substitutes or replacements for parts of the body; Appliances for connecting them with the body; Devices providing patency to, or preventing collapsing of, tubular structures of the body, e.g. stents
    • A61F2/02—Prostheses implantable into the body
    • A61F2/24—Heart valves ; Vascular valves, e.g. venous valves; Heart implants, e.g. passive devices for improving the function of the native valve or the heart muscle; Transmyocardial revascularisation [TMR] devices; Valves implantable in the body
    • A61F2/2427—Devices for manipulating or deploying heart valves during implantation
    • A61F2/243—Deployment by mechanical expansion
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61F—FILTERS IMPLANTABLE INTO BLOOD VESSELS; PROSTHESES; DEVICES PROVIDING PATENCY TO, OR PREVENTING COLLAPSING OF, TUBULAR STRUCTURES OF THE BODY, e.g. STENTS; ORTHOPAEDIC, NURSING OR CONTRACEPTIVE DEVICES; FOMENTATION; TREATMENT OR PROTECTION OF EYES OR EARS; BANDAGES, DRESSINGS OR ABSORBENT PADS; FIRST-AID KITS
    • A61F2/00—Filters implantable into blood vessels; Prostheses, i.e. artificial substitutes or replacements for parts of the body; Appliances for connecting them with the body; Devices providing patency to, or preventing collapsing of, tubular structures of the body, e.g. stents
    • A61F2/02—Prostheses implantable into the body
    • A61F2/24—Heart valves ; Vascular valves, e.g. venous valves; Heart implants, e.g. passive devices for improving the function of the native valve or the heart muscle; Transmyocardial revascularisation [TMR] devices; Valves implantable in the body
    • A61F2/2427—Devices for manipulating or deploying heart valves during implantation
    • A61F2/2436—Deployment by retracting a sheath
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61F—FILTERS IMPLANTABLE INTO BLOOD VESSELS; PROSTHESES; DEVICES PROVIDING PATENCY TO, OR PREVENTING COLLAPSING OF, TUBULAR STRUCTURES OF THE BODY, e.g. STENTS; ORTHOPAEDIC, NURSING OR CONTRACEPTIVE DEVICES; FOMENTATION; TREATMENT OR PROTECTION OF EYES OR EARS; BANDAGES, DRESSINGS OR ABSORBENT PADS; FIRST-AID KITS
    • A61F2220/00—Fixations or connections for prostheses classified in groups A61F2/00 - A61F2/26 or A61F2/82 or A61F9/00 or A61F11/00 or subgroups thereof
    • A61F2220/0025—Connections or couplings between prosthetic parts, e.g. between modular parts; Connecting elements
    • A61F2220/0075—Connections or couplings between prosthetic parts, e.g. between modular parts; Connecting elements sutured, ligatured or stitched, retained or tied with a rope, string, thread, wire or cable
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61F—FILTERS IMPLANTABLE INTO BLOOD VESSELS; PROSTHESES; DEVICES PROVIDING PATENCY TO, OR PREVENTING COLLAPSING OF, TUBULAR STRUCTURES OF THE BODY, e.g. STENTS; ORTHOPAEDIC, NURSING OR CONTRACEPTIVE DEVICES; FOMENTATION; TREATMENT OR PROTECTION OF EYES OR EARS; BANDAGES, DRESSINGS OR ABSORBENT PADS; FIRST-AID KITS
    • A61F2250/00—Special features of prostheses classified in groups A61F2/00 - A61F2/26 or A61F2/82 or A61F9/00 or A61F11/00 or subgroups thereof
    • A61F2250/0014—Special features of prostheses classified in groups A61F2/00 - A61F2/26 or A61F2/82 or A61F9/00 or A61F11/00 or subgroups thereof having different values of a given property or geometrical feature, e.g. mechanical property or material property, at different locations within the same prosthesis
    • A61F2250/0018—Special features of prostheses classified in groups A61F2/00 - A61F2/26 or A61F2/82 or A61F9/00 or A61F11/00 or subgroups thereof having different values of a given property or geometrical feature, e.g. mechanical property or material property, at different locations within the same prosthesis differing in elasticity, stiffness or compressibility

Definitions

  • WO 01/49213 A2 discloses prosthetic heart valves comprising a graft member covering at least a portion of an ablumenal surface of a stent-body.
  • WO 2004/032987 A1 discloses a medical device comprising a bio-compatible polymeric product with a layered structure.
  • US 2001/007656 A1 discloses a stent-valve comprising a skirt folded over a bottom portion of the stent.
  • Synthetic valves and biological valves have been used for cardiac valve replacement with varying results. Synthetic valves rarely fail but require life-long anti-coagulant treatment to prevent blood from clotting (thrombosis) in and around the replacement valve. Such anti-coagulant treatment significantly limits patients' activities and can cause various other complications. Biological valves do not require such anti-coagulation treatment but typically fail within 10-15 years. Thus, to limit the need for and risks associated with re-operation on failed biological valves, traditionally only patients with less than about 10-15 years to live have received biological valve replacements. Patients with longer life expectancies have received synthetic valves and anti-coagulant treatment.
  • PHVT percutaneous heart valve replacement therapies
  • Some embodiments described herein are directed to systems, methods, and devices for cardiac valve replacement. For example, these methods, systems, and devices may be applicable to the full range of cardiac-valve therapies including the replacement of failed aortic, mitral, tricuspid, and pulmonary valves. Some embodiments may facilitate a surgical approach whereby surgery is performed on a beating heart without the need for an open-chest cavity and heart-lung bypass. This minimally-invasive surgical approach may reduce the risks associated with replacing a failed native valve in the first instance, as well as the risks associated with secondary or subsequent surgeries to replace failed artificial (e.g., biological or synthetic) valves.
  • failed artificial e.g., biological or synthetic
  • Stent-valves include a valve component and at least one stent component (e.g., a single-stent-valve or a double-stent-valve).
  • the valve component may include a biological or synthetic (e.g., mechanical) valve and/or any other suitable material(s).
  • the stent and valve components are capable of at least two configurations: a collapsed configuration (e.g., during delivery) and an expanded configuration (e.g., after implantation).
  • the stent component of a stent-valve may include a first strut and a second strut with ends located at different positions along a longitudinal axis of the stent component, wherein the first strut and the second strut provide an axial resistance for anchoring the stent at an implantation site.
  • Multiple installations of the first strut and the second strut may be provided, where such installations are positioned horizontally along a perimeter of the stent component.
  • the first strut and the second strut may be connected.
  • the stent-component of a stent valve may include multiple locking elements protruding outwardly from an outer surface of the stent component, where each locking element includes a first end adjacent to the outer surface of the stent component and a second end spaced apart from the outer surface of the stent component.
  • the second end of at least a first locking element may be located at a different position along a longitudinal axis of the stent component than the second end of at least a second locking element.
  • the first locking element and the second locking element may have substantially the same lengths, and the first ends of the first and second locking elements may be positioned at multiple, different levels along the longitudinal axis of the stent component.
  • the first locking element and the second locking element may have different lengths, and the first ends of the first and second locking elements may be positioned at substantially the same level along the longitudinal axis of the stent component.
  • the stent component of a stent-valve may include at least a first commissural post and a second commissural post adjacent to a body of the stent component, where the external contours of the first and second commissural posts collectively form a generally concave shape.
  • each of the external contours may slope inwardly toward the center of the corresponding commissural post in the direction of the body of the stent component.
  • external contours of adjacent commissural posts may be generally convexly shaped.
  • the valve component of a stent-valve includes an outer surface covered with fabric (e.g., at least a portion thereof, or substantially the entire surface).
  • the valve component may include at least one suture along a free edge of the valve component and at least one suture along an inflow free edge of the valve component, where the fabric includes a skirt that extends below the valve component. A free edge of the skirt is folded over a bottom portion of the corresponding stent component and sutured to the stent component.
  • substantially all or at least a portion of the fibers of the fabric are oriented +/- 45 degrees with respect to a longitudinal axis of the valve component.
  • the stent component may include at least one Y-shaped structure fixed to the valve component by one or more (e.g., 3) sutures forming a corresponding Y-shaped configuration.
  • the stent component comprises an annular groove and the free edge of the skirt is positioned within the groove.
  • the free edge of the skirt comprises at least one cut oriented in the direction of a longitudinal axis of the stent component.
  • the annular groove may be at least partially filled with a fibrous, foam, or other biocompatible material.
  • a stent-valve delivery system is provided.
  • a first assembly is provided that includes an outer sheath and a guide wire tubing.
  • the delivery system also includes a second assembly including a stent holder configured for removable attachment to at least one attachment element of a stent-valve.
  • the stent-valve may be positioned over the guide wire tubing of the first assembly.
  • the first assembly and the second assembly may be configured for relative movement with respect to one another in order to transition from a closed position to an open position.
  • the outer sheath In the closed position, the outer sheath may encompass the stent-valve still attached to the stent holder and thus constrain expansion of the stent-valve.
  • the open position the outer sheath may not constrain expansion of the stent-valve and thus the stent-valve may detach from the stent holder and expand to a fully expanded configuration.
  • the first assembly and the second assembly may be configured to transition from the closed position, to a partially-open position, to the open position.
  • the stent-valve In the partially-open position, the stent-valve may expand partially but not detach from the stent holder because the outer sheath may still encompass the at least one attachment element of the stent-valve and the stent holder.
  • it may be determined whether the stent-valve will be positioned correctly if the stent-valve is expanded to the fully expanded configuration.
  • the functionality of the stent-valve may be tested (e.g., to determine whether the stent-valve will permit sufficient blood-flow) when the stent-valve is in the partially-expanded configuration.
  • the first assembly of the stent-valve delivery system may include a coil-reinforced outer sheath and/or a substantially dome-shaped tip, which may provide resistance to kinking due to the bending moment acting onto the delivery system during positioning within, for example, an aortic arch.
  • the stent holder of the delivery system may include proximal and distal components positioned adjacent to one another (i.e., no gap). This may reduce or eliminate the risk of catching or damaging the outer sheath of the first assembly when closing the delivery device.
  • the stent holder may include at least one chamfered edge positioned adjacent to at least one attachment pin of the stent holder, where the at least one attachment pin is configured for removable attachment to an attachment element of a stent component.
  • the chamfered edge may assist with the release and expansion of the stent-valve from the stent holder when the stent holder is rotated axially.
  • an apparatus for positioning and attaching a stent-valve comprising a plurality of attachment elements to a corresponding plurality of attachment pins of a stent holder.
  • the apparatus may include an elongate, pliable member (e.g., suture or wire) configured to be threaded through the plurality of attachment elements.
  • the apparatus may also include a tube for receiving the elongate, pliable member. Pulling the elongate, pliable member through the tubing while holding the tubing in a fixed position may collapse the stent-valve diameter to allow for engagement of the attachment elements to the attachment pins.
  • an apparatus for collapsing a diameter of a stent-valve to allow capture of the stent-valve within a sheath of a delivery system.
  • the apparatus may include an elongate, substantially flat strip comprising a slit positioned perpendicular to a longitudinal axis of the strip.
  • the elongate, substantially flat strip may include an end having a height less than a height of the slit, such that insertion of the end into the slit forms a loop.
  • pulling the end through the slit causes a reduction of the loop diameter and thereby collapses the diameter of the stent-valve.
  • the elongate, substantially flat strip may be formed from any suitable material including, for example, polymer and metal.
  • FIG. 1 shows a stent component according to some embodiments that includes single struts 102 in a proximal section of the stent.
  • FIG. 2 shows a stent component according to some embodiments that includes two struts (202, 204) in a proximal section of the stent.
  • double struts may increase the radial resistance to crush of the stent (e.g., axial resistance) and the out of plane bending stiffness of the stent proximal section, thus improving the anchoring of the stent within, for example, a failed biological valve or a calcified native annulus.
  • first strut 202 and second strut 204 are provided, where second strut 204 may be a reinforcement within first strut 202.
  • FIGS. 3 and 4 show some embodiments of stent components that include multiple locking elements positioned at multiple, different levels, such that at least one locking element is located more proximally than another locking element.
  • the locking elements may engage, for example, a failed biological valve or calcified native annulus.
  • the portions of locking elements 302 located adjacent to the outer surface of the stent component are positioned at multiple, different levels (304 a, b, c) and each locking element 302 has the same or similar length 306. These locking elements may have a similar out of plane bending stiffness.
  • the portions of locking elements 402 located adjacent to the outer surface of the stent component are positioned at the same level 404 and the locking elements 402 have multiple different lengths (406 a, b, c).
  • the shorter locking elements 402 may have a higher out of plane stiffness. High out of plane bending stiffness may prevent a complete circular expansion of the stent-valve which could result in paravalvular leaks.
  • FIGS. 5 and 6 show stent components according to some embodiments having different stem (e.g., commissural post) configurations according to some embodiments of the present invention.
  • each of the external contours (e.g., wires) of adjacent stems 502 and 504 may have a generally convex shape 506.
  • FIG. 6 shows another embodiment in which the external contours of adjacent stems (602, 604) collectively form a generally concave shape 606.
  • the concave shape may also have inward-sloping characteristic(s). For example, as shown in FIG. 6 , each of the external arches slopes inwardly toward the center of the corresponding stem in the direction of the body 608 of the stent.
  • a concavely-shaped stem may, for example, avoid the contact of the valve leaflets with the expanded stent during systole and improve the blood flow to the coronary arteries.
  • Other embodiments of stent components include, for example, stents that include both convexly- and concavely-shaped stems (e.g., a stent component including at least one stem 502 and at least one stem 602).
  • FIG. 7 shows a stent component according to some embodiments that includes reinforcement of a proximal section of the stent with the connection of the double struts 702 (e.g., connection of struts 202 and 204 of FIG. 2 ).
  • This increases the radial force/resistance to crushing of the stent and the out of plane bending stiffness of the elements forming the proximal section, thus improving the anchoring of the stent-valve within the calcified annulus.
  • the attachment elements are reinforced 704 to reduce the risk of kinking under compression during stent-valve release.
  • Geometry 706 has also been changed (e.g., optimized) to locally reduce stresses and strains.
  • FIG. 8 shows a stent component according to some embodiments in which the attachment elements 802 are positioned between the commissural posts. This may reduce the overall stent length and accordingly the length of the delivery system, thus avoiding its distal section entering deeply into the ascending aorta/aortic arch during stent-valve release.
  • FIGS. 9 and 10 show additional details regarding stent-valves in accordance with some embodiments of the present invention.
  • a fabric reinforcement is provided that covers all, or substantially all, of the valve outer surface down to the skirt 902. This may prevent pulling out of sutures and wearing of the valve due to contact with the stent.
  • a continuous suture 904 along the trimmed aortic sinus may be provided, which may allow for firm fixation of the valve to the stent commissural posts. Together with continuous suture 906 along the perimeter of the inflow margin, suture 904 may also increase seal integrity.
  • the fabric that covers the skirt may be integral to and continuous with the fabric that extends between sutures 904 and 906, although in other embodiments the skirt fabric and the fabric between sutures 904 and 906 may be two separate pieces of fabric that are joined by the sutures.
  • the fibers of the fabric may be oriented +/- 45° with respect to the stent-valve longitudinal axis. This may allow the diameter of the skirt to self adapt to the diameter of the stent in its proximal grooved/flared section by slightly re-orienting the fiber direction (smaller angle within groove, larger angle within flared section).
  • FIG. 10 shows details regarding the suturing the valve and fabric of FIG. 9 to a stent according to some embodiments of the present invention.
  • the proximal section of the skirt 1002 may be folded over the proximal flared/grooved proximal stent section.
  • Y-shaped sutures 1004 may be provided that hold the valve firmly within the stent and increase seal integrity.
  • each Y-shaped connection may be made out of one or more independent sutures, where multiple sutures may be provided to avoid leakage in case of a rupture of any single stitch.
  • Free floating edge 1006 of the skirt may be positioned within the groove of the stent and may serve as a further blood barrier by promoting clotting.
  • longitudinal cuts 1008 are made along the free floating edge between the sutures to build flexible flaps around the circumference of the stent within the groove. This may improve the barrier effect and increase conformability of the skirt.
  • the sealing of the prosthesis may be improved by at least partially filling the groove with a fibrous, foam like, or other suitable biocompatible material.
  • the skirt may have a smooth inner surface to minimize blood shear at the annular inflow tract of the prosthesis.
  • a more structured surface may be provided on the outer surface of the prosthesis in order to, for example, improve the sealing of the stent-valve at the implantation site.
  • FIG. 11 shows a stent-valve according to some embodiments that includes a multi- (e.g., three) component fabric reinforcement.
  • Each component may have a trapezoid geometry to accommodate the variation of the stent inner diameter over its longitudinal axis.
  • the components When the components are sutured together, they may form a cylindrical or part-cylindrical skirt, which is flared at one extremity to avoid constraining the stent and thereby reducing its anchoring force within the annuals.
  • FIG. 12 shows two configurations for a distal section of a stent-valve delivery system.
  • Distal configuration 1202 includes a generally dilator shaped, longer tip with an unreinforced outer stent sheath.
  • distal configuration 1204 includes a generally bullet or domed shaped, shorter tip with a coil-reinforced outer stent sheath.
  • coil-reinforced sheaths including, for example, extrusion of an inner and an outer tubing, coiling of a stainless steel wire, and assembling the three components by fusion bonding on a mandrel.
  • distal configuration 1204 may have improved resistance to kinking due to the bending moment acting onto the delivery system during positioning within, for example, an aortic arch. More specifically, the coil-reinforced stent outer sheath may increase the mechanical kink resistance of the stent delivery system. The use of the bullet shaped tip with reduced length may decrease the bending moment of the delivery system.
  • FIGS. 13 and 14 show two configurations of a stent holder of stent-valve delivery system.
  • the stent holder includes proximal and distal components separated by a gap 1302.
  • the component actually holding the stent is the middle, metallic component.
  • the distal component may be conically shaped to facilitate closing of the sheath and to avoid catching the pins.
  • the proximal component may serve as a guide for the attachment elements of the stent and may prevent them from kinking under compression during stent-valve release.
  • the distal, metallic, and proximal components may be separate pieces, whereas in other embodiments they may be a single piece of solid construction.
  • the proximal and distal components are positioned adjacent to one another and thus the gap is removed, which may reduce or eliminate the risk of catching or damaging the stent outer sheath 1304 when closing the delivery device.
  • FIG. 15 shows another configuration of a stent holder.
  • one or both of the edges (1502, 1504) located adjacent to element 1506 (e.g., pin) configured for removable attachment to a stent component may be chamfered.
  • the stent holder may include multiple (e.g., three) such elements 1506 and adjacent chamfered edge(s). The inclusion of chamfered edge(s) on the surface of the stent holder may help to release the stent-valve from element(s) 1506 of the stent holder when a rotational force is applied, for example, to a hold handle of the delivery system.
  • FIG. 16 shows a stent-valve delivery system in which a distal section of the delivery system has a reduced length (e.g., the length which enters into the ascending aorta) relative to a delivery system with a chamfered distal tip.
  • a hollow tip 1602 may be provided that encapsulates the attachment elements/stentholder assembly, which may provide for the reduced length. Placing the attachment elements between the commissural posts may allow for a further reduction in the length of the delivery system.
  • FIG. 17 shows a stent-valve delivery system with gear-box type release handle according to some embodiments, which includes opened and closed positions. To move from one position to the other, a rotation of the handle is required prior to translation, thus reducing handling errors.
  • FIG. 18 shows a stent-valve delivery system with a trigger type release handle according to some embodiments.
  • translational movement for opening the delivery system and releasing the stent-valve may be provided by pressing the trigger, thus releasing a braking system and pushing forward the metal shaft connected to the stent outer sheath.
  • This system advantageously allows a one hand release of the stent-valve, whereas the other hand takes care of the positioning of the implant.
  • the design of this release handle may be similar to, for example, products commercially available for dispensing, for example, silicone.
  • FIG. 19 shows a mid section of a stent-valve delivery system according to some embodiments, which may include a shaft having a bending stiffness which varies from its proximal to distal ends.
  • a stiff proximal shaft may provide for pushability of the delivery system, whereas the flexible distal section may allow for an improved trackability in curves.
  • the shaft may include openings (e.g., water jet cut openings) along its longitudinal axis ( FIG. 17 and 19 ), where the openings may be oriented towards two perpendicular axes with respect to the shaft cross section.
  • FIG. 20 shows a positioning device for assisting a physician to implant a stent-valve at an appropriate location according to some embodiments.
  • the positioning device comprises three self expanding (e.g. nitinol) fingers or feelers constrained within an outer sheath, which may be co-axially slideable into the stent-valve delivery system. By retracting the outer sheath, the feelers start to expand and can be positioned under the inflow tract of, for example, the aortic valve under fluoroscopic assistance. By exerting a slight force towards the annulus, the three fingers may act as a landmark for implanting the stent-valve.
  • three self expanding e.g. nitinol
  • feelers By retracting the outer sheath, the feelers start to expand and can be positioned under the inflow tract of, for example, the aortic valve under fluoroscopic assistance.
  • the three fingers may act as a landmark for implanting the stent-valve.
  • FIGS. 21A-C show a system and corresponding method for positioning and attaching a stent-valve to a stent holder.
  • a suture or other pliable, continuous element 2102 e.g., wire
  • the stent-valve diameter may be collapsed and the attachment elements may engage the element(s) (e.g., pins 2106) of the stent holder.
  • both ends of the suture are free (such that both ends are fed through the tube and then pulled).
  • one end of the suture is free whereas the other end is fixed (e.g., to the tubing), such that only one end of the suture is thread through the tubing and pulled.
  • outer sheath 2108 may be pulled proximally over the attachment elements, as shown in FIGS. 21B and 21C . The suture may then be removed by pulling it back through the attachment elements.
  • FIGS. 22A-C show a system and corresponding method for crimping a stent-valve onto a delivery system according to some embodiments.
  • FIG. 22A shows a thin, flat (e.g., polymer or metallic) strip 2202 with a slit 2204 perpendicular to its longitudinal axis and having a wide edge 2206 at one end and a narrower edge 2208 at the opposite end.
  • the narrow edge is inserted into the slit (i.e., the slit having a greater height than a height of the narrow edge)
  • the strip forms a loop.
  • FIGS. 21A-C and 22A-C provide for ease of use by physicians or other technicians. In some embodiments, these positioning and crimping systems may be low cost and disposable, and may be delivered as sterile accessories together with the delivery system and/or the stent-valve.
  • stent-valves e.g., single-stent-valves, double-stent-valves
  • associated methods and systems for surgery are provided.

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  • Health & Medical Sciences (AREA)
  • Cardiology (AREA)
  • Engineering & Computer Science (AREA)
  • Biomedical Technology (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Transplantation (AREA)
  • Heart & Thoracic Surgery (AREA)
  • Vascular Medicine (AREA)
  • Oral & Maxillofacial Surgery (AREA)
  • Animal Behavior & Ethology (AREA)
  • General Health & Medical Sciences (AREA)
  • Public Health (AREA)
  • Veterinary Medicine (AREA)
  • Mechanical Engineering (AREA)
  • Prostheses (AREA)
  • Media Introduction/Drainage Providing Device (AREA)

Claims (7)

  1. Ersatzklappe für die Verwendung in dem menschlichen Körper, umfassend eine Klappenkomponente, die eine äußere Oberfläche umfasst, die wenigstens teilweise mit Gewebe überzogen ist, und
    eine Stentkomponente zum Aufnehmen der Klappenkomponente,
    wobei die Stentkomponente und die Klappenkomponente zu wenigstens einer kollabierten Konfiguration zum Zuführen und einer expandierten Konfiguration nach der Implantation fähig sind,
    wobei das Gewebe eine Schürze (902, 1002) mit einem freien Rand umfasst, der über einen unteren Teil der Stentkomponente gefaltet und an die Stentkomponente angenäht ist,
    dadurch gekennzeichnet, dass
    der freie Rand wenigstens einen Schnitt (1008) umfasst, wobei der wenigstens eine Schnitt (1008) in der Richtung der Längsachse der Stentkomponente ausgerichtet ist.
  2. Klappe gemäß Anspruch 1, wobei der wenigstens eine Schnitt (1008) entlang eines freiliegenden Rands (1006) der Schürze zwischen Nähten des freien Rands der Schürze angeordnet ist.
  3. Klappe gemäß Anspruch 1, wobei die Schürze (902, 1002) eine Vielzahl von Schnitten (1008) entlang eines freiliegenden Rands (1006) der Schürze (902, 1002) zwischen Nähten des freien Rands der Schürze (902, 1002) umfasst, um flexible Flügel um den Umfang der Stentkomponente zu bilden.
  4. Klappe gemäß einem der vorstehenden Ansprüche,
    wobei die Schürze (902, 1002) eine Vielkomponenten-Gewebeverstärkung umfasst, wobei die Komponenten zusammengenäht sind.
  5. Klappe gemäß Anspruch 4, wobei die genähten Komponenten eine zylindrische oder teilzylindrische Schürze bilden, die an einem Ende aufgeweitet ist, um Einschränkung des Stents zu verhindern.
  6. Klappe gemäß einem der vorstehenden Ansprüche,
    wobei die Klappenkomponente wenigstens eine Naht entlang eines freien Einströmrands der Klappenkomponente umfasst und wobei die Schürze über die Klappenkomponente vorragt.
  7. Klappe gemäß einem der vorstehenden Ansprüche,
    wobei wenigstens ein Teil der Fasern des Gewebes unter +/- 45 Grad bezogen auf die Längsachse der Klappenkomponente angeordnet ist.
EP16152466.5A 2007-08-21 2008-08-21 Ersatzklappe Revoked EP3045147B8 (de)

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